System for handling sewage



Nov. 27, 1934. c. H. NoRDl-:LL

SYSTEM FOR HANDLING SEWAGE Filed Jn. 3. 1953 3 SheetS-Sheer, l4

ATTORNEY.

Nov.K 27, 1934.

C. H. NORDELL YSYSTEM lF011 HANDLING sEwAGE Filed Jan. 3,' 1933 3, Sheets-Sheet 2 klv ATTORNEY.

NOV- 27, 1934- c. H. NORDELL SYSTEM FOR HANDLING SEWAGE Filed Jan. s', 193s 3 Sheets-Sheet 5 INVNTOR.

ATTORNEY.

l ma H. /VORU 82%,@

strained and the solid particles to a small enough size along with the flow of the liquids there- VPatented Nov. 27, 1934 This invention relates to sewage or trade is to provide a system of screens and comminuters whereby great volumes of sewage may be reduced screens through.

lAnother object is economy in operation, and an arrangement of screening units which requires only a Wit PATENT oFFlcE `SYSTEM FOR HANDLING SEWAGE Carl H. Nordell, Chicago, Ill. Application January 3, 19h33, Serial No. 649,798

11 claims.

systems for handling wastes and its principal object comminuted or to pass through minimum amount of power to operate them. h these and other objects and advantages in view, this invention consists in a system for handling sewage in which is comprised one or more large screens through which the greater portion of the sewage is strained, and one or more comminuters associated therewith and serving to reduce the solids, which are intercepted by the large screen,

into size small enough to pass through screens and ow on with the Vliquid that is strainedy by the further consis larger screen. The invention ts in a system for handling sewage in which the greater part of the strained liquid is sent on for suitable which requires further disposal and that part treatment is sent on through a different channel or duct to a suitable disposal plant.

The invention novel featureshereinafter fully set forth and claimed.

The invention is clearly illustrated in the drawings accompanying this invention in which:

Fig. 1 horizont further consists ln the several is a view partly in plan and partly in al section of a structure illustrating a simple embodiment of the system forming the subject matter o Fig. 2 is a ver on the broken line 2-2 of Fig. 1;

Fig. 3 is a vertical cross section taken on the line 3--3 of Fig. 1;

Fig. 4 is a detail horizontal section of one of the comminuters taken on the line -4-4 of Fig. 2;

Fig. 5 is a detail fragmental side elevation of f the present specification;

t'cal longitudinal section taken ,the comminuter seen' in Fig. 4; and

Fig. 6 is a` vertical longitudinn section inus-l trating a slightly modified form of the invention. Referring to said drawings, and rst to Figs. 1-to 5 inclusive, the reference character 10 designates the approach tunnel or conduit, through which raw sewage -or sewage after passing -through coarse screens, passes .through aneck 11 to and through a screen chamber; k1'7, grit chamber `proper 16 comprise side wa From the gr and thence to the which-conveniently may lls 12, and ia' ytrough-dike bottom it chamber'the vstrained sewage tends from one side wall 12 opening 24 in the (Cl. 21o-152) or trade waste flows on to another plant -for subsequent treatment. A ramp or inclined bottom 14 leads to the screen chamber and an obliquely disposed side wall 15 is provided which forms a neck or passage 1l of such capacity as to maintain a 60 sufficient velocity through this passage to prevent material from settling therein.

The passage 11 empties into the screen chamber 17 which is formed by a masonry base 18, built up inthe grit chamber 16, a curved end wall 19, desirably yin the form of a metal wall, and a bottom 20 also desirably formed of metal. The end wall 19 is preferably semi-circular and exto the other. An bottom wall 20 connects the 70- screen chamber 17 with the bottom portion of the grit chamber or channel 16.

A screen or strainer A of great capacity is contained in the screen chamber, and intercepts larger solids, but permits the liquids and smaller solids and semi-solids to pass through the opening 24 to the grit chamber or discharge conduit or duct 16. Desirably'the screen A, is composed of spaced rings 21 suitably secured together by bolts or otherwise andhaving a closed top 21a. The 80 screen is suspended or mounted over the opening 24 and as shown is suspended from a bracket comprising a column 22 and a side arm 23. The column 22 and screen are supported by a bridge structure 25 of structural design, and a motor 26 85 is mounted on the bridge to rotate the screen through speed reduction gearing contained in a gear casing 27 disposed under the motor and driving a shaft 27 connected to the screen.

The screen rotates about a vertical axis, and water and waste entering through the slots between the rings pass downwardly through the screen and discharge through the opening 24 into the grit chamber 16 from which it flows on for further treatment.

For the purpose of keeping the slots of the screen free from accumulated matter a comb or toothed scraper is-provided which has teeth 28, supported in a s 'pporting head 29 which is swingably mounted upon a column 30 located at the 100 end of the wall'15. A rock shaft 31 connected tb the head 29` and supported in bearings 33 ex-A tends up into convenient position for ,manipulation and has a hand lever .32 on itsk upper end by which thev shaft and therewith the scraper. head 105 29 may be turned. With'this arrangement the teeth of the comb or toothed scraper may be dis-` engaged from the slots between the rings or the screen, when the screen is being-z started or to clean the comb.

i solids are reduced l l Fig. 4 serves for the purposes of illustration.

Particles which will not pass through the slots between the rings of the screen, are carried around by the, rings, due to the contact established by lighter liquids flowing to and through the screen and when they reach the teeth 28 of the comb or scraper, these-solids are dislodged from the screen, and collect in a chamber 34'10- cated directly beyond the comb as is seen in Fig. 1. The clianber 34 is provided with an inclined bottom 35 to direct the accumulating heavysolids to a comminuter B, located in the screen chamber 17 adjacent the lower end of the inclined bottom of the chamber 34, and by which the heavy sufficiently in size `to pass throughthe comminuter and join the ow from the main screen A.

Desirably the comminuter comprises a plurality of spaced rings 36-suitably secured together, to form a drum-like structure, supported and rotated by a vertical shaft 37 .connected to and driven by an electric motor 38 through reduction gearing 39. vA bearing 40, mounted on a column 41, steadies the lower end of the shaft 37` and said column carries the motor 38 at its upper end. A comb or toothed scraper 42 secured to the column 41 with itsl teeth entering the slots between the rings 36 provides means for keeping the slots free from accumulating matter.

The comminuting elements may comprise cutters or choppers 43 disposed on the peripheries of the rings 36, and co-operating with the comb or toothed scraper 42 to break up the solids. The slots in the comb between the teeththereof are of suiiicient depth to permit the cutters or choppers 43 to pass through. i The cutters or choppers may take any desired form and the one ilustrated in The cutters or choppers co-operate with the comb 42 to cut and tear the solids into small enough particles to pass through the slots between the rings 36 along with the owing liquids,

The comminuter B is placed over the upper end of a duct 44 that leads through the masonry to the lower end of the grit chamber or channel 16, and discharges the mass, that passes through the commuter B, into the' grit chamber,` whereby it commingles with the strained liquids which are discharged thereinto by the screen A, and passes on for further treatment.

The comminuter B handles the heavier solids that sinkto the bottom of the screen chamber. Lighter solids are contained in the sewage or other trade waste treated, which solids float at or near the top of the stream. In order to reduce the lighter solids into sufciently small fragments y that can be handled inthe treatment of the sew" age, a second comminuter C, is provided which as shown is located just below the level ofthe incoming liquid. The comminuter C is mounted in a recess 45 formed by a continuation of the side wall 19 of the screen chamber 17, the bottom 51 of which recess is raised above the bottom 20 and runs to the side wall 12; The comminuter C may' comprise substantially the same construction as the comminuter B, and likewise has spaced connected rings 46 provided with cutters or choppers co-operating with a comb or toothed scraperl for comminuting the solids. 'I'he comminuter C is located over an opening 50 in the bottom 51 and discharges -the comminuted'. material and liquid into the grit chamber permitting it to commingle with the strained liquids discharged by the screen A and comminuter B. 'I'he comminuter C .is supported and` rotated by a shaft 47 driven by a motor 48 through speed reduction 48 'is mounted on pry through the screen portion of the comminuterl and discharge with the iiow of liquid into the grit chamber. The lighter solids are attacked by the comminuter C and by it reduced to a small enoughy size to pass through the screen portion thereof along with the ow of liquid to the grit chamber.

4From the above it will be apparent that a large screen or strainer may be employed for handling the bulk of the sewage or trade waste, and that, the screen is continuously kept clear so that the liquids may freely pass therethrough.

Inasmuch as the large screen does nothave .to break up the solid matter, only suflicient power is required to rotate the screen against the scraping action of the comb or scraper, and inasmuch as the comminuters Yare made relatively small as compared 'with the size of the main screen, no great amount of them, consequently the massl can be handled economically and without danger of injury to the several parts.

In the modified form illustrated in Fig. 6, the main screen D, comminuters F and G are constructed and disposed in the same relation as are the corresponding parts in the preferred form. Instead of discharging the comminuted particles and liquids into the same channel E, as the main screen D discharges the strained liquids, the comminuters F, G discharge .through separate ducts I, H into a separate channel J which leads olf to some other`place, than the channel E. This form of the .invention is particularly desirable in connection with sewers when' hanpower is required to driveI dling storm waters, as' when there is an abable place for treatment or otherwise, and the strained and are conductedA through agrit 0r settling chamber E to a suitsolids `are comminuted by the comminuters F, G A

and the mass conveyed (along with the liquids passing through them) subsequent treatment.

to a separate place for while the invention has been shown and described in connection, with sewage disposal, it is to -be .understood that, the apparatus and method described can be used in connection with the handling of other liquids containing'solids and semi-solid material.

I claim as new and Patent:

1. In a systemfor handling sewage, the combination of 'main straining means, and a separate submerged cdmminuter for comminuting solids intercepted by the straining means without removing the solids from the sewage, said comminuter discharging the comminuted material beneath the surface of the sewage.

' 2. In la system for handling liquid containing solids, the combination of main straining means, a separate submerged comminuter'means for com-'- minuting solids intercepted by the straining means, and means beneath the surface of the liquid for discharging the strainedwliquid and comminuted mass into a. common place, without Lacasse Aremoving the comminuted material from the liquid.

3.A In a system for handling liquid containing solids, the combination of main straining means, aseparate submerged comminuter for comminuting solids intercepted by the straining means, and

means beneath the surface of the liquid for separately discharging the strained liquid and comminuted mass beneath the surface of the liquid into separate non-communicating channels.

4. Iny a system for handling liquid containing solids, the combination of a chamber, main straining means therein, separate submergedfcomminuting means located adjacent the surface of the liquids in the chamber for comminuting `light solids intercepted by the main straining means, and other comminuting means submerged in the liquid adjacent the bottom of the chamber for comminuting heavy interceptedA solids.

5. In a system for handling sewage, the combination of a chamber, main straining means therein, separate submerged comminuting means 1ocated adjacent the surface of the sewage in the chamber for comminuting light solids intercepted by the main straining means, other comminuting means submerged in the sewage and located adjacent the bottom of the chamber for comminutingheavy intercepted solids, and means for discharging the strained liquids and comminuted mass into a common place.

6. In a system for handling sewage the combination of a self-cleaning main screen and a separate submerged comminuter having a selfcleaning screen, both discharging beneath the surface of the sewage.

7. In a systemfor handling liquid containing solids the combination of a self-cleaning main screen, a separate submerged comminuter having a self-cleaning screen, and a duct beneath the surface of the liquid for conveying the comminuted mass and discharging the same beneath the surface into the liquid strained by the main screen.

8. In a system for handling sewage, the combination of a motor driven, self-cleaning rotary screen, and a separate, motor driven, submerged rotary comminuter having a self-cleaning screen for discharging the comminuted mass beneath the surfacelinto the strained liquid.

9. In a system for handling sewage, the combination of a motor driven self-cleaning rotary screen, a separate motor driven submerged rotary comminuter, having a self-cleaning screen, a conduit for conveying away the liquid strained by the main screen, and a conduit beneath the surface of the sewage for discharging the mass v straining means through which the major portion of the liquids are strained, and a submerged commnuter having a rotary screen to which solids pass that are intercepted by the main screen, saidrcomminuter serving to reduce solids beneath the surface of the sewage to smaller size capable of passing through the screen, and discharging the comminuted material beneath the surface.

ll. 'I'he process of handling sewage containing solids which consists in straining the sewage and, without removing the solids from the remainder of the sewage, separately comminuting intercepted solids under the surface of the sewage and passing the comminuted material through a strainer beneath the surface of the sewage.

CARL H. NORDELL. 

